3-Bit Down Counter Aim: To study and Verify the 3-Bit Down Counter.4 bit Up/Down Counter using 74HC191 Aim: To study and Verify the 4 bit Up/Down Counter using 74HC191.The Vcc and ground should be applied carefully at the specified pin only.Ĭonclusion We have learned all the Design and Implementation of 2-Bit Up Counter.The connections should be tight on trainer kit.Make the connections according to the IC pin diagram. The J B and K B inputs are connected to Q A. The J A and K A inputs of FF-A are tied to logic 1. The one advantage of synchronous counter over asynchronous counter is, it can operate on higher frequency than asynchronous counter as it does not have cumulative delay because of same clock is given to each flip flop. Synchronous Counters - â Unlike the asynchronous counter, synchronous counter has one global clock which drives each flip flop so output changes in parallel. External clock is applied to the clock input of flip-flop A and Q A output is applied to the clock input of the next flip-flop i.e. But we can use the JK flip-flop also with J and K connected permanently to logic 1. We can understand it by following diagram. Counters are broadly divided into two categories -Īsynchronous or Ripple Counters - â In asynchronous counter we donât use universal clock, only first flip flop is driven by main clock and the clock input of rest of the following counters is driven by output of previous flip flops. It is a group of flip-flops with a clock signal applied. Not only counting, a counter can follow the certain sequence based on our design like any random sequence 0,1,3,2.They can also be designed with the help of flip flops.flip-flops. For example, in UP counter a counter increases count for every rising edge of clock. Counters are used in digital electronics for counting purpose, they can count specific event happening in the circuit. Power Off Trainer Kit, disconnect all the wire connections and remove IC's from IC-Base.Ĭounter - â In digital logic and computing, a Counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock signal.Note down the corresponding output readings for various combinations of inputs.Apply various combinations of inputs according to the truth table and observe the condition of LEDs.Connect the outputs to the switches of O/P LEDs.Connect the inputs to the input switches provided in the IC Trainer Kit.Implement the circuit as shown in the circuit diagram.Connect VCC and ground to respective pins of IC Trainer Kit.2-Bit Asynchronous UP Counter using 74LS76.IC Used For 2-Bit Asynchronous UP Counter using 74LS76: IC NumberÄual Master-Slave J-K Flip-Flops with Clear, Preset, and Complementary Outputs To understand key elements of TTL logic specification or datasheets.To develop digital circuit building and troubleshooting skills.To apply knowledge of the fundamental gates to create truth tables.To understand the behavior and demonstrate the operation of 2-Bit Up Counter.
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